package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.BaseException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import io.swagger.util.Json;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImp implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;
    private Orders orders;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {
        // 判断地址薄为空、购物车为空情况
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        ShoppingCart shoppingCart = new ShoppingCart();
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }
        // 向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setAddress(addressBook.getDetail()); //  地址
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee()); // 收货人
        orders.setUserId(userId);

        this.orders = orders;

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        // 向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail(); // 订单明细
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId()); // 订单id
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);
        // 清除当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);
        // 创建一个订单VO对象，将数据封装其中，并返回
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);
        
        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(ordersPaymentDTO.getOrderNumber());
        
        // 判断订单是否已支付
        if (ordersDB != null && ordersDB.getPayStatus() == Orders.PAID) {
            throw new OrderBusinessException("该订单已支付");
        }
        
        // 创建模拟支付的返回数据
        OrderPaymentVO vo = OrderPaymentVO.builder()
                .nonceStr("nonceStr" + System.currentTimeMillis())
                .paySign("paySign" + System.currentTimeMillis())
                .timeStamp(String.valueOf(System.currentTimeMillis() / 1000))
                .signType("RSA")
                .packageStr("prepay_id=wx" + System.currentTimeMillis())
                .build();
                
        // 更新订单状态
        if (ordersDB != null) {
            Integer orderPaidStatus = Orders.PAID;  // 支付状态，已支付
            Integer orderStatus = Orders.TO_BE_CONFIRMED;  // 订单状态，待接单
            LocalDateTime checkOutTime = LocalDateTime.now();  // 更新支付时间
            orderMapper.updateStatus(orderStatus, orderPaidStatus, checkOutTime, ordersDB.getId());
            
            // 通过WebSocket向客户端推送订单状态（可选）
            Map<String, Object> map = new HashMap<>();
            map.put("type", 1); // 1表示来单提醒 2表示客户催单
            map.put("orderId", ordersDB.getId());
            map.put("content", "订单号：" + ordersPaymentDTO.getOrderNumber());
            String json = JSON.toJSONString(map);
            webSocketServer.sendToAllClient(json);
        }
        
        return vo;
    }

    /**
     * 支付成功，修改订单状态
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);
        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);

        // 通过WebSocket向客户端推送订单状态
        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒 2表示客户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + outTradeNo);
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 历史订单查询
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);
        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 查询出订单明细，并封装入OrderVO进行响应
        List<OrderVO> list = new ArrayList<>();
        if (page != null && page.size() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id
                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);
                // 封装VO,用于响应订单列表
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);
                list.add(orderVO);
            }
        }

        return new PageResult(page.getTotal(), list);
    }

    /**
     * 订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        // 订单id
        Orders orders = orderMapper.getById(id);
        // 根据订单id查询包含的菜品和套餐数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 取消订单
     * @param id
     */
    @Transactional // 建议添加事务注解
    // TODO 待测试
    public void userCancelById(Long id) {
        Orders orders = orderMapper.getById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if (orders.getPayStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Integer status = orders.getStatus();
        // 待支付和待接单状态下，用户可直接取消订单
        if (status != Orders.PENDING_PAYMENT && status != Orders.TO_BE_CONFIRMED) {
            throw new OrderBusinessException("订单不能取消");
        }

        // 商家已接单状态下，用户取消订单需电话沟通商家
        if (status == Orders.TO_BE_CONFIRMED) {
            throw new OrderBusinessException("商家已接单，取消订单请电话联系商家");
        }

        // 派送中状态下，用户取消订单需电话沟通商家
        if (status == Orders.DELIVERY_IN_PROGRESS) {
            throw new OrderBusinessException("订单正在派送中，取消订单请电话联系商家");
        }

        // 设置订单状态为已取消
        orders.setStatus(Orders.CANCELLED);

        try {
            // 如果在待接单状态下取消订单，需要给用户退款
            if (status == Orders.TO_BE_CONFIRMED) {
                weChatPayUtil.refund(
                        orders.getNumber(),
                        orders.getNumber(),
                        new BigDecimal(0.01),
                        new BigDecimal(0.01)
                );
            }
        } catch (Exception e) {
            // 记录日志并抛出自定义异常
            log.error("退款失败", e);
            throw new OrderBusinessException("退款失败，请稍后重试");
        }
        // 统一更新订单状态
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     * @param id
     */
    @Override
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();
        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());
            return shoppingCart;
        }).collect(Collectors.toList());
        // 添加到购物车
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);
        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);
        return new PageResult(page.getTotal(), orderVOList);
    }
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> ordersList = page.getResult();
        if (ordersList != null && ordersList.size() > 0) {
            for (Orders orders : ordersList) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }

        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());
        // 将订单菜品详情信息转换成购物车对象
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String dish =  x.getName() + "*" + x.getNumber() + ";";
            return dish;
        }).collect(Collectors.toList());
        // 将该订单对应的所有菜品信息拼接在一起
        String orderDishes = String.join("", orderDishList);
        return orderDishes;
    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);
        // 组装结果数据
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    /**
     * 接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        // 商家接单其实就是将订单的状态修改为“已接单”
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        // 商家拒单时，如果用户已经完成了支付，需要为用户退款
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        // 判断当前订单是否为待接单状态
        if (ordersDB.getStatus().intValue() != Orders.TO_BE_CONFIRMED) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        } else {
            if (ordersDB.getStatus().intValue() == Orders.PAID) {
                // 退款
                weChatPayUtil.refund(
                        ordersDB.getNumber(),
                        ordersDB.getNumber(),
                        new BigDecimal(0.01),
                        new BigDecimal(0.01)
                );
                ordersDB.setPayStatus(Orders.REFUND);
            }
            ordersDB = Orders.builder()
                    .id(ordersRejectionDTO.getId())
                    .status(Orders.CANCELLED)
                    .cancelReason(ordersRejectionDTO.getRejectionReason())
                    .cancelTime(LocalDateTime.now())
                    .build();
            orderMapper.update(ordersDB);
        }
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 商家拒单时，如果用户已经完成了支付，需要为用户退款
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());
        // 已接单--带派送、派送中可以点击取消订单
        if (
                ordersDB.getStatus().intValue() != Orders.CONFIRMED &&
                        ordersDB.getStatus().intValue() != Orders.DELIVERY_IN_PROGRESS &&
                        ordersDB.getStatus().intValue() != Orders.COMPLETED
        ) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        } else {
            if (ordersDB.getStatus().intValue() == Orders.PAID) {
                // 退款
                weChatPayUtil.refund(
                        ordersDB.getNumber(),
                        ordersDB.getNumber(),
                        new BigDecimal(0.01),
                        new BigDecimal(0.01)
                );
                ordersDB.setPayStatus(Orders.REFUND);
            }
            ordersDB = Orders.builder()
                    .id(ordersCancelDTO.getId())
                    .status(Orders.CANCELLED)
                    .cancelReason(ordersCancelDTO.getCancelReason())
                    .cancelTime(LocalDateTime.now())
                    .build();
            orderMapper.update(ordersDB);
        }
    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        // 判断状态：是否为待派送状态
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB.getStatus().intValue() != Orders.CONFIRMED) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        } else {
            ordersDB.setStatus(Orders.DELIVERY_IN_PROGRESS);
            orderMapper.update(ordersDB);
        }
    }

    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id) {
        // 判断状态：是否为派送中
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB.getStatus().intValue() != Orders.DELIVERY_IN_PROGRESS) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        } else {
            ordersDB.setStatus(Orders.COMPLETED);
            orderMapper.update(ordersDB);
        }
    }

    /**
     * 客户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Map map = new HashMap<>();
        map.put("type", 2);
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + ordersDB.getNumber());
        // 通过WebSocket向客户端推送消息
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }
}
